"Avengers: Age of Ultron" director Joss Whedon tweeted his final tweet on Monday, following the absolutely massive opening weekend for his equally massive Marvel movie. Why? Well, that's the question, isn't it?

Many folks believed Whedon deleted his Twitter account after suffering backlash from viewers furious over the treatment of Black Widow in the "Avengers" sequel. According to Whedon, however, that theory couldn't be further from the truth. Indeed, it is "horsesh*t," as he calls it.

“I saw a lot of people say, ‘Well, the social justice warriors destroyed one of their own!’ It’s like, Nope. That didn’t happen," he told BuzzFeed about his Twitter departure. "Believe me, I have been attacked by militant feminists since I got on Twitter. That’s something I’m used to. Every breed of feminism is attacking every other breed, and every subsection of liberalism is always busy attacking another subsection of liberalism, because god forbid they should all band together and actually fight for the cause."

Instead, Whedon revealed that he withdrew from the social media site in order to focus on stories he could tell using more than 140 characters at a time.

“I just thought, 'Wait a minute, if I’m going to start writing again, I have to go to the quiet place … And this is the least quiet place I’ve ever been in my life,'" he said. "It’s like taking the bar exam at Coachella. It’s like, Um, I really need to concentrate on this! Guys! Can you all just… I have to… It’s super important for my law!”

In the end, Whedon said it's not about anyone trolling him off of Twitter, or Twitter itself being an inherently bad service — instead, "the real issue is me," he said.

"Twitter is an addictive little thing, and if it’s there, I gotta check it. When you keep doing something after it stops giving you pleasure, that’s kind of rock bottom for an addict," he said. "I just had a little moment of clarity where I’m like, You know what? If I want to get stuff done, I need to not constantly hit this thing for a news item or a joke or some praise, and then be suddenly sad when there’s hate and then hate and then hate."

There you have it, then. The real reason behind Whedon's Twitter departure. As he himself might have tweeted once upon a time: "It's not you, Twitter. It's me."